Paper ballots are great, but if you want paper ballots to serve as a check on error or fraud in electronic tabulation, you have to do some hand counting.
Hand-count samples are commonly called "post-election audits," and there is a growing consensus among computer scientists who study voting systems that audits are at least as important as the mere existence of the paper.
The report of the Brennan Center Task Force on Voting System Security said it best. From p. 83:
The value of paper ballots without the Automatic Routine Audits is highly
questionable
.
UPDATE: The original title of this diary was that New Hampshie "nailed the case" for audits. The case did not need to be nailed, as some have observed in comments. The primary reminds us why audits are important, because they can offer a basis for reassurance to citizens who have been paying attention to e-voting problems, and are concerned.
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